Diaphragm pump

ABSTRACT

A diaphragm pump including: a pump body including an upper cover, a valve seat and a cylinder body connected in sequence. The valve seat has a water inlet hole and a water outlet hole. The upper cover and the valve seat define a water inlet cavity and a water outlet cavity independent from each other. The water inlet hole communicates with the water inlet cavity while the water outlet hole communicates with the water outlet cavity. A mounting base is provided to a bottom of the water outlet cavity, and a plurality of spaced first position-limiting members are formed at a top of the water outlet cavity and extend downwards. A water inlet valve block is provided to a bottom surface of the valve seat to open or close the water inlet hole. A diaphragm assembly controls opening or closure of the water outlet hole.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority to and benefits of Chinese PatentApplication Serial No. 201720497206.9, filed with the State IntellectualProperty Office of P. R. China on May 5, 2017, Chinese PatentApplication Serial No. 201721098389.3, filed with the State IntellectualProperty Office of P. R. China on Aug. 30, 2017, Chinese PatentApplication Serial No. 201721098388.9, filed with the State IntellectualProperty Office of P. R. China on Aug. 30, 2017, Chinese PatentApplication Serial No. 201721098390.6, filed with the State IntellectualProperty Office of P. R. China on Aug. 30, 2017, Chinese PatentApplication Serial No. 201721097501.1, filed with the State IntellectualProperty Office of P. R. China on Aug. 30, 2017, and Chinese PatentApplication Serial No. 201721097409.5, filed with the State IntellectualProperty Office of P. R. China on Aug. 30, 2017, the entire content ofwhich are incorporated herein by reference.

FIELD

The present disclosure relates to a technical field of pumps, and moreparticularly to a diaphragm pump.

BACKGROUND

A micro water pump in the related art has unstable water flow and lowefficiency.

SUMMARY

Embodiments of the present disclosure seek to solve at least one of theproblems existing in the related art to at least some extent.

Accordingly, the present disclosure provides a diaphragm pump that hasstable flow.

The diaphragm pump according to embodiments of the present disclosureincludes: a pump body including an upper cover, a valve seat and acylinder body connected in sequence, the valve seat having a water inlethole and a water outlet hole, the upper cover and the valve seatdefining a water inlet cavity and a water outlet cavity independent fromeach other, the water inlet hole being in communication with the waterinlet cavity while the water outlet hole being in communication with thewater outlet cavity, a mounting base being provided to a bottom of thewater outlet cavity, and a plurality of spaced first position-limitingmembers being formed at a top of the water outlet cavity and extendingdownwards; a water inlet valve block provided to a bottom surface of thevalve seat to open or close the water inlet hole; a diaphragm assemblymounted to the mounting base to control opening or closure of the wateroutlet hole, and including a plurality of water outlet valve blocksarranged opposite to the plurality of first position-limiting members; apiston assembly connected to a bottom of the valve seat, and including acapsule body having a capsule cavity, the capsule cavity beingcommunicated with the water inlet cavity and the water outlet cavitythrough the water inlet hole and the water outlet hole respectively; aconnecting rod assembly driving the capsule body to swing up and downbetween an upper movement dead point and a lower movement dead point tosqueeze or stretch the capsule cavity so as to realize a function ofpumping fluid, the connecting rod assembly including: a connecting rodconnected with the capsule body, a steel shaft having an upper endconnected with a connecting hole, and an eccentric wheel connected witha lower end of the steel shaft; a driving assembly including: a baseseat connected to the pump body to define a chamber and an electricmotor having an electric motor shaft connected with the eccentric wheel.

In the diaphragm pump according to embodiments of the presentdisclosure, since the plurality of spaced first position-limitingmembers are formed at the top of the water outlet cavity and extenddownwards, a degree of openness of the water outlet valve block can belimited by the first position-limiting members, and an output flow ofthe diaphragm pump keeps stable.

In addition, the diaphragm pump according to embodiments of the presentdisclosure can further include the following additional technicalfeatures.

According to some embodiments of the present disclosure, the diaphragmassembly includes a positioning plate having an upper surface and alower surface both configured as flat surfaces. The positioning plateincludes: a central positioning plate; and positioning strips connectedto a circumferential edge of the central positioning plate and extendsalong a radial direction of the central positioning plate. The wateroutlet valve block is connected to the circumferential edge of thecentral positioning plate and extends along the radial direction of thecentral positioning plate, and a distance between an upper surface ofthe water outlet valve block and the upper surface of the positioningplate is identical to a distance between a lower surface of the wateroutlet valve block and the lower surface of the positioning plate, thewater outlet valve block being located between two positioning strips.

According to some embodiments of the present disclosure, the mountingbase has a mounting groove matching the positioning plate in shape.Moreover, the mounting groove includes: a central groove in which thecentral positioning plate is snapped; branch grooves distributed in acircumferential direction of the central groove and communicated withthe central groove, the positioning strip being snapped in the branchgroove, a second position-limiting member being provided to the top ofthe water outlet cavity, and a lower end of the second position-limitingmember being in contact with an upper surface of the positioning strip.

According to some embodiments of the present disclosure, a distancebetween an upper surface of the branch groove and the lower end of thesecond position-limiting member is smaller than a thickness of thepositioning strip.

According to some embodiments of the present disclosure, the centralgroove is provided with a first positioning column, and the centralpositioning plate is provided with a first positioning hole fitted withthe first positioning column.

According to some embodiments of the present disclosure, a rib isprovided along a peripheral edge of the mounting groove.

According to some embodiments of the present disclosure, an end of thebranch groove away from the central groove is provided with a baffle,and an upper surface of the baffle is higher than an upper surface ofthe rib.

According to some embodiments of the present disclosure, the bottom ofthe water outlet cavity is provided with a support stand having athrough hole in communication with the water outlet hole, and thesupport stand is connected to the rib at a circumferential edge of thecentral groove.

According to some embodiments of the present disclosure, a diaphragmpart is provided between the water outlet valve block and the centralpositioning plate, and an arc groove is formed at a position where aperipheral edge of the diaphragm part is connected with the positioningstrip.

According to some embodiments of the present disclosure, a connectingbridge is provided between the support stand and the rib, and theconnecting bridge is disposed opposite to the diaphragm part.

According to some embodiments of the present disclosure, the positioningstrips are equally spaced and distributed along the circumferential edgeof the central groove, and the water outlet valve block and two adjacentpositioning strips are spaced from each other.

According to some embodiments of the present disclosure, the upper coverconstructs a downwardly open cavity structure, and an upper annularpartition plate is provided to a bottom surface of the upper cover; thevalve seat constructs an upwardly open cavity structure, and a lowerannular partition plate corresponding to the upper annular partitionplate is provided to a top surface of the valve seat.

According to some embodiments of the present disclosure, a bottomsurface of the cylinder body extends downwards to form a stoppingmember, and a lower end face of the stopping member is opposite to andspaced at a predetermined distance from a central position in a topsurface of the connecting rod.

According to some embodiments of the present disclosure, the capsulebody includes: a plurality of capsule cavities opened upwards; a panellocated between the valve seat and the cylinder body and connected torespective upper outer circumferential edges of the plurality of capsulecavities, so as to connect the plurality of capsule cavities into awhole; a mounting column connected to a bottom of the capsule cavity,the connecting rod being provided with a second mounting hole fittedwith the mounting column.

According to some embodiments of the present disclosure, the capsulecavity includes: a thin-walled part having a bottom surface connectedwith an upper end of the mounting column; and a thick-walled part havinga lower end whose circumferential edge is connected with acircumferential edge of an upper end of the thin-walled part, and anupper end whose circumferential edge is connected with a bottom surfaceof the panel.

According to some embodiments of the present disclosure, a wallthickness of the thick-walled part is larger than that of thethin-walled part.

According to some embodiments of the present disclosure, a secondpositioning column is provided to a top surface of the cylinder body andextends upwards, and the panel is provided with a second positioninghole fitted with the second positioning column.

According to some embodiments of the present disclosure, the secondpositioning column is in interference fit with the second positioninghole.

According to some embodiments of the present disclosure, the cylinderbody is provided with a first mounting hole, and the capsule body issnapped into the first mounting hole and immobilized relative to thefirst mounting hole.

According to some embodiments of the present disclosure, a columnar bossis provided to the bottom surface of the valve seat and extendsdownwards, the columnar boss has the water inlet hole penetratingthrough the bottom and top surfaces of the valve seat, and acircumferential wall of the columnar boss extends obliquely from up todown to form a first inclined surface.

According to some embodiments of the present disclosure, an upper innercircumferential edge of the capsule cavity extends obliquely from up todown to form a second inclined surface, the first inclined surface beingclosely fitted with the second inclined surface.

According to some embodiments of the present disclosure, the columnarboss has a third positioning hole configured to immobilize the waterinlet valve block, and a plurality of water inlet holes are defined in acircumferential direction of the third positioning hole.

According to some embodiments of the present disclosure, the water inletvalve block includes: a valve membrane covering the water inlet hole;and a third positioning column having a first end connected to the valvemembrane and a second end upwardly extending through the thirdpositioning hole.

According to some embodiments of the present disclosure, the first endof the third positioning column forms an anti-rotation flange, and thethird positioning hole has a position-limiting groove fitted with theanti-rotation flange.

According to some embodiments of the present disclosure, the second endof the third positioning column has a position-limiting protrusion, andthe position-limiting protrusion abuts against the top surface of thevalve seat.

According to some embodiments of the present disclosure, the columnarboss has an avoidance notch, and an inlet end of the water outlet holeis arranged opposite to the avoidance notch.

According to some embodiments of the present disclosure, three columnarbosses are provided to the bottom surface of the valve seat, and thethree columnar bosses constitute an equilateral triangle.

According to some embodiments of the present disclosure, the connectingrod includes: a rod body having a first end of the rod body providedwith the connecting hole extending along an axial direction of the rodbody, a circumferential face of the connecting hole being provided witha plurality of heat radiating grooves, and the plurality of heatradiating grooves extending along an axial direction of the connectinghole; and a mounting plate connected to a second end of the rod body, aplurality of connecting arms being spaced along a circumferentialdirection of the mounting plate, the mounting plate having a pluralityof material-reducing holes formed by recessing a top surface of themounting plate downwardly, the plurality of connecting arms obliquelyextending downwards and outwards from a central position in the mountingplate, a free end of each connecting arm being provided with a mountingprotrusion, and a lower end face of the mounting protrusion being lowerthan a lower end face of the connecting arm.

According to some embodiments of the present disclosure, a reinforcingrib is provided between an outer circumferential surface of the mountingprotrusion and an outer circumferential surface of the rod body, and thereinforcing rib extends upwards to be connected to a bottom surface ofthe mounting plate.

According to some embodiments of the present disclosure, the diaphragmpump further includes: a photoelectric shielding sheet integrally formedwith the eccentric wheel and rotating synchronously with the eccentricwheel and the electric motor shaft; and a photoelectric sensor providedto the base seat and cooperating with the photoelectric shielding sheetso as to detect a rotational speed of the electric motor shaft and senda detection signal to an electric motor controller, the electric motorcontroller being configured to adjust the rotational speed of theelectric motor shaft of the electric motor according to the detectionsignal.

According to some embodiments of the present disclosure, thephotoelectric shielding sheet extends outwards along a radial directionof the eccentric wheel.

According to some embodiments of the present disclosure, thephotoelectric shielding sheet includes: a positioning portion providedto an upper surface of the eccentric wheel; and a shielding portionconnected to the positioning portion and extending radially outwards.

BRIEF DESCRIPTION OF THE DRAWINGS

These and other aspects and advantages of embodiments of the presentdisclosure will become apparent and more readily appreciated from thefollowing descriptions made with reference to the drawings, in which:

FIG. 1 is a partially sectional view of a diaphragm pump according to anembodiment of the present disclosure;

FIG. 2 is an exploded view of a diaphragm pump according to anembodiment of the present disclosure;

FIG. 3 is a partially sectional view of a diaphragm pump according to anembodiment of the present disclosure;

FIG. 4 is a perspective view of an upper cover according to anembodiment of the present disclosure;

FIG. 5 is a bottom view of an upper cover according to an embodiment ofthe present disclosure;

FIG. 6 is a perspective view of a valve seat according to an embodimentof the present disclosure;

FIG. 7 is a perspective view of a diaphragm assembly according to anembodiment of the present disclosure;

FIG. 8 is a perspective view of a diaphragm assembly mounted to a valveseat according to an embodiment of the present disclosure;

FIG. 9 is a top view of a diaphragm assembly mounted to a valve seataccording to an embodiment of the present disclosure;

FIG. 10 is a perspective view of a cylinder body according to anembodiment of the present disclosure;

FIG. 11 is a perspective view of a cylinder body according to anembodiment of the present disclosure;

FIG. 12 is a perspective view of a capsule body according to anembodiment of the present disclosure;

FIG. 13 is a perspective view of a capsule body according to anembodiment of the present disclosure;

FIG. 14 is a perspective view of a valve seat according to an embodimentof the present disclosure;

FIG. 15 is a sectional view taken along line A-A of FIG. 14 according toan embodiment of the present disclosure;

FIG. 16 is a perspective view of a valve seat according to an embodimentof the present disclosure;

FIG. 17 is a perspective view of a water inlet valve block according toan embodiment of the present disclosure;

FIG. 18 is a perspective view of a connecting rod according to anembodiment of the present disclosure;

FIG. 19 is a bottom view of a connecting rod according to an embodimentof the present disclosure;

FIG. 20 is a sectional view taken along line B-B of FIG. 19 according toan embodiment of the present disclosure;

FIG. 21 is a perspective view of a connecting rod assembly according toan embodiment of the present disclosure;

FIG. 22 is a bottom view of a connecting rod assembly according to anembodiment of the present disclosure;

FIG. 23 is a sectional view taken along line C-C of FIG. 22 according toan embodiment of the present disclosure;

FIG. 24 is an assembly view of a photoelectric sensor, a printed circuitboard and a lead wire connector according to an embodiment of thepresent disclosure;

FIG. 25 is a perspective view of a lead wire according to an embodimentof the present disclosure.

REFERENCE NUMERALS

diaphragm pump 100,

driving assembly 10, base seat 11, electric motor 12, electric motorshaft 121,

pump body 20,

-   -   cavity 21, water outlet cavity 211, water inlet cavity 212,    -   upper cover 22, first position-limiting member 221, second        position-limiting member 222, upper annular partition plate 223,        water inlet pipe 224, water outlet pipe 225,    -   valve seat 23, mounting base 230, first positioning column 2303,        rib 2304, support stand 231, lower annular partition plate 232,        mounting groove 233, central groove 2331, branch groove 2332,        baffle 2333, connecting bridge 234, water outlet hole 235, water        inlet hole 236, columnar boss 237, first inclined surface 2370,        third positioning hole 2371, position-limiting groove 2372,        avoidance notch 2373,    -   cylinder body 24, stopping member 241, second positioning column        242, first mounting hole 243,    -   diaphragm assembly 25, water outlet valve block 251, positioning        plate 252, central positioning plate 2521, positioning strip        2522, first positioning hole 253, diaphragm part 254,    -   water inlet valve block 26, valve membrane 261, third        positioning column 262, anti-rotation flange 263,        position-limiting protrusion 264,    -   chamber 27,    -   connecting rod assembly 30; connecting rod 31, second mounting        hole 311, rod body 312, connecting hole 3121, heat radiating        groove 3122, mounting plate 313, material-reducing hole 3131,        connecting arm 314, mounting protrusion 3141, reinforcing rib        315,    -   steel shaft 32,    -   eccentric wheel 33, eccentric hole 331,

photoelectric shielding sheet 40, inclined hole 41,

photoelectric sensor 50,

printed circuit board 70, lead wire connector 71, lead wire jack 711,

lead wire 80, lead wire plug 81,

piston assembly 90, capsule body 91, panel 911, second positioning hole9110, capsule cavity 912, second inclined surface 9120, thick-walledpart 913, thin-walled part 914, mounting column 915.

DETAILED DESCRIPTION

Reference will be made in detail to embodiments of the presentdisclosure. The same or similar elements and the elements having same orsimilar functions are denoted by like reference numerals throughout thedescriptions. The embodiments described herein with reference todrawings are explanatory, illustrative, and used to generally understandthe present disclosure rather than construed to limit the presentdisclosure.

A diaphragm pump 100 according to embodiments of the present disclosurewill be described in below with reference to FIGS. 1-25. The diaphragmpump 100 can be widely used in technical fields of medical equipment andhome appliances. For example, the diaphragm pump 100 may be applied in acoffee machine or a juicer, and water is pumped to the coffee machine orthe juicer through the diaphragm pump 100. For another example, thediaphragm pump 100 may also be applied in a sphygmomanometer, a car seator a massage chair, and the sphygmomanometer, the car seat or themassage chair may be inflated or deflated through the diaphragm pump100. It could be understood that, the above description is justillustrative, and is not a limit to the protection scope of the presentdisclosure.

The diaphragm pump 100 according to embodiments of the presentdisclosure, as shown in FIGS. 1, 2 and 3, can generally include a pumpbody 20, a water inlet valve block 26, a diaphragm assembly 25, a pistonassembly 90, a connecting rod assembly 30 and a driving assembly 10. Thedriving assembly 10 can include a base seat 11 and an electric motor 12provided to the base seat 11.

The pump body 20 includes an upper cover 22, a valve seat 23 and acylinder body 24 which are connected in sequence. The valve seat 23 isprovided with a water inlet hole 236 and a water outlet hole 235. Theupper cover 22 and the valve seat 23 define a water inlet cavity 212 anda water outlet cavity 211 independent from each other, the water inlethole 236 is in communication with the water inlet cavity 212, and thewater outlet hole 235 is in communication with the water outlet cavity211. A bottom of the water outlet cavity 211 is provided with a mountingbase 230. As shown in FIG. 4, a plurality of first position-limitingmembers 221 spaced from each other are formed at a top of the wateroutlet cavity 211 and extend downwards.

The water inlet valve block 26 is provided to a bottom surface of thevalve seat 23 to open or close the water inlet hole 236. The diaphragmassembly 25 is mounted to the mounting base 230 to control opening orclosure of the water outlet hole 235. The diaphragm assembly 25 includesa plurality of water outlet valve blocks 251 arranged opposite to theplurality of first position-limiting members 221.

The piston assembly 90 is connected to a bottom of the valve seat 23,and includes a capsule body 91 having a capsule cavity 912. The capsulecavity 912 is communicated with the water inlet cavity 212 and the wateroutlet cavity 211 through the water inlet hole 236 and the water outlethole 235 respectively.

The connecting rod assembly 30 drives the capsule body 91 to swing upand down between an upper movement dead point and a lower movement deadpoint to squeeze or stretch the capsule cavity 912 to realize a functionof pumping fluid. The connecting rod assembly 30 includes a connectingrod 31, a steel shaft 32 and an eccentric wheel 33. The connecting rod31 is connected with the capsule body 91, and the steel shaft 32 has anupper end connected with a connecting hole 3121 and a lower endconnected with the eccentric wheel 33. The driving assembly 10 includesthe base seat 11 and the electric motor 12, the pump body 20 isconnected to the base seat 11 to define a chamber 27, and the electricmotor 12 has an electric motor shaft 121 that is connected with theeccentric wheel 33.

Specifically, as shown in FIGS. 1, 2 and 3, the pump body 20 can includethe upper cover 22, the valve seat 23 and the cylinder body 24 which areconnected in sequence. The upper cover 22 includes a water inlet pipe224 having a water inlet and a water outlet pipe 225 having a wateroutlet. The valve seat 23 is provided with a plurality of groups ofwater outlet holes 235 and a plurality of groups of water inlet holes236. The water inlet valve block 26 for opening or closing the waterinlet hole 236 is provided at a position on a lower surface of the valveseat 23 corresponding to each group of water inlet holes 236, and forexample is an umbrella-shaped valve. The diaphragm assembly 25 foropening or closing the water outlet hole 235 is provided at a positionon an upper surface of the valve seat 23 corresponding to the wateroutlet hole 235.

As shown in FIGS. 10, 11, 12 and 13, the cylinder body 24 is connectedbetween the valve seat 23 and the base seat 11, and the cylinder body 24is provided with a plurality of first mounting holes 243. The pistonassembly 90 for pumping the fluid is mounted to the cylinder body 24.The piston assembly 90 has a plurality of capsule bodies 91 and a panel911 for connecting the plurality of capsule bodies 91. Each capsule body91 falls into the first mounting hole 243. Each capsule body 91 includesthe capsule cavity 912 and a mounting column 915. An upper end of thecapsule cavity 912 is open, and the panel 911 and a circumferential edgeof the upper end of each capsule cavity 912 are connected and formedintegrally. A lower end of the capsule cavity 912 is connected with anupper end of the mounting column 915. Each capsule cavity 912 runsthrough the first mounting hole 243 and is closely provided to an uppersurface of the cylinder body 24 by the panel 911. The valve seat 23 ispressed on the panel 911 so that the piston assembly 90 is clampedbetween the valve seat 23 and the base seat 11.

The upper cover 22 and the valve seat 23 may be snap-fitted together,the valve seat 23 and the cylinder body 24 being snap-fitted together aswell as the cylinder body 24 and the base seat 11 being snap-fittedtogether, and then all of them may be connected into a whole by aplurality of clamps. The pump body 20 may be configured as a squareframe or a cylindrical frame.

As shown in FIGS. 1, 3 and 13, the connecting rod assembly 30 isconnected with the electric motor shaft 121 of the electric motor 12 andthe mounting column 915 separately, such that during rotation of theelectric motor 12, the connecting rod assembly 30 drives the capsulebody 91 to swing up and down, thereby compressing and expanding thecapsule cavity 912 to perform a process of pumping the fluid. In thediaphragm pump 100, during the opening or closure of the water outletvalve block 251, the first position-limiting member 221 limits a degreeof openness of the water outlet valve block 251, that is, upon an uppersurface of the water outlet valve block 251 touches a lower end face ofthe first position-limiting member 221, the first position-limitingmember 221 will prevent the water outlet valve block 251 from continuingmoving upwards, such that the degree of openness of the water outletvalve block 251 remains constant, and hence an output flow of thediaphragm pump 100 remains constant. Furthermore, the firstposition-limiting member 221 solves a problem that the water outletvalve block 251 opens upwards excessively and cannot be restored.

Therefore, in the diaphragm pump 100 according to embodiments of thepresent disclosure, since the plurality of spaced firstposition-limiting members 221 are formed at the top of the water outletcavity 211 and extend downwards, the degree of openness of the wateroutlet valve block 251 can be limited by the first position-limitingmembers 221, and the output flow of the diaphragm pump 100 keeps stable.

In some embodiments of the present disclosure, referring to FIGS. 6 and7, the diaphragm assembly 25 includes a positioning plate 252. Thepositioning plate 252 includes a central positioning plate 2521 and apositioning strip 2522, and the positioning strip 2522 is connected to acircumferential edge of the central positioning plate 2521 and extendsalong a radial direction of the central positioning plate 2521. Thewater outlet valve block 251 is connected to the circumferential edge ofthe central positioning plate 2521 and extends along the radialdirection of the central positioning plate 2521, and the water outletvalve block 251 is located between two positioning strips 2522. Theplurality of water outlet valve blocks 251 are integrated and providedto the positioning plate 252, so as to facilitate processing and moldingof the diaphragm assembly 25 and reduce production costs.

In an optional embodiment, upper and lower surfaces of the diaphragmassembly 25 can be configured as flat surfaces, such that it isunnecessary to distinguish which direction the diaphragm assembly 25 ismounted to the mounting base 230, thereby improving mounting efficiency.

In some embodiments of the present disclosure, as shown in FIG. 6, themounting base 230 has a mounting groove 233, and the mounting groove 233includes a central groove 2331 and branch grooves 2332. The centralpositioning plate 2521 is snapped in the central groove 2331, the branchgrooves 2332 are distributed in a circumferential direction of thecentral groove 2331 and communicated with the central groove 2331, andthe positioning strip 2522 is snapped in the branch groove 2332. The topof the water outlet cavity 211 is provided with a secondposition-limiting member 222, and a lower end of the secondposition-limiting member 222 is in contact with an upper surface of thepositioning strip 2522.

As shown in FIG. 4, the second position-limiting member 222 is providedat the top of the water outlet cavity 211, and the lower end of thesecond position-limiting member 222 is in contact with the upper surfaceof the positioning strip 2522. That is, the positioning strip 2522 ofthe diaphragm assembly 25 is defined in the branch groove 2332,displacement of the positioning strip 2522 in the circumferentialdirection is restricted by the branch groove 2332, and displacement ofthe positioning strip 2522 in an up-and-down direction is restricted bythe second position-limiting member 222. Thus, the diaphragm assembly 25can be mounted and positioned on the mounting base 230 effectively, anddisplacement of the diaphragm assembly 25 can be avoided to enable thediaphragm pump 100 to pump the fluid normally.

In some optional embodiments, a distance between an upper surface of thebranch groove 2332 and the lower end of the second position-limitingmember 222 is smaller than a thickness of the positioning strip 2522.That is, when the diaphragm assembly 25 is assembled to the mountingbase 230, the second position-limiting member 222 can be pressed againstand limit the upper surface of the positioning strip 2522, i.e. when thesecond position-limiting member 222 acts on the upper surface of thepositioning strip 2522, the positioning strip 2522 is compressedslightly, and hence the displacement of the positioning strip 2522 inthe up-and-down direction is defined effectively.

Certainly, it could be understood that the lower end of the secondposition-limiting member 222 may not apply a pre-pressure to the uppersurface of the positioning strip 2522, i.e. the lower end of the secondposition-limiting member 222 is fitted with the upper surface of thepositioning strip 2522 with zero compression.

In some embodiments, as shown in FIG. 6, the central groove 2331 isprovided with a first positioning column 2303, and the centralpositioning plate 2521 is provided with a first positioning hole 253fitted with the first positioning column 2303. The fitting between thefirst positioning column 2303 and the first positioning hole 253 servesas an initial positioning and provides a basis for the subsequentinstallation of the diaphragm assembly 25.

In some specific embodiments, as shown in FIGS. 6 and 8, a rib 2304 isprovided along a peripheral edge of the mounting groove 233. The rib2304 extends upwards to define an accommodating space for the diaphragmassembly 25, thereby effectively limiting a degree of freedom of thediaphragm assembly 25 in the circumferential direction.

In a specific embodiment, as shown in FIGS. 6 and 8, an end of thebranch groove 2332 away from the central groove 2331 is provided with abaffle 2333, and an upper surface of the baffle 2333 is higher than anupper surface of the rib 2304. The central positioning plate 2521 issnapped in the central groove 2331, and the positioning strip 2522 issnapped in the branch groove 2332.

During the installation of the diaphragm assembly 25, the centralpositioning plate 2521 can be first pressed in the central groove 2331,and then the positioning strip 2522 is pressed into the branch groove2332. Since the end of the branch groove 2332 is provided with thebaffle 2333 higher than the rib 2304, it is possible to prevent thepositioning strip 2522 from moving along a circumferential direction ofthe central positioning plate 2521 and enhance stability of theinstallation of the diaphragm assembly 25, such that the water outletvalve block 251 and the water outlet hole 235 are accurately fitted toeffectively control the opening and closure of the water outlet hole235.

In some other optional embodiments, as shown in FIG. 6, the bottom ofthe water outlet cavity 211 is provided with a support stand 231 havinga through hole in communication with the water outlet hole 235, and thesupport stand 231 is connected to the rib 2304 at a circumferential edgeof the central groove 2331. Thus, after the diaphragm assembly 25 isassembled to the mounting base 230, the water outlet valve block 251 issupported on an upper surface of the support stand 231 to enable thewater outlet valve block 251 to close an upper opening of the wateroutlet hole 235.

In a specific embodiment of the present disclosure, as shown in FIGS. 7,8 and 9, the positioning strips 2522 are equally spaced and distributedalong the circumferential edge of the central groove 2331, and the wateroutlet valve block 251 and two adjacent positioning strips 2522 arespaced from each other. Specifically, the diaphragm assembly 25 ispositioned on the valve seat 23, in which the water outlet valve block251 is arranged corresponding to the support stand 231 of the wateroutlet hole 235. When the diaphragm pump 100 operates to drain water,water flows through the water outlet hole 235, under the water pressure,the water outlet valve block 251 covering the water outlet hole 235 isopened, and the water flows into the water outlet cavity 211. It couldbe understood that a thickness of the water outlet valve block 251 issmaller than the thickness of the positioning strip 2522, and a raisedheight of the support stand 231 makes the upper surface of the supportstand 231 just in contact with a lower surface of the water outlet valveblock 251, which ensures sealing performance.

In an optional embodiment, referring to FIGS. 7, 8 and 9, a diaphragmpart 254 is provided between the water outlet valve block 251 and thecentral positioning plate 2521, and an arc groove is formed at aposition where a peripheral edge of the diaphragm part 254 is connectedwith the positioning strip 2522. It could be understood that thediaphragm part 254 is thinner than the water outlet valve block 251, andin a certain range, the thinner diaphragm part 254 has better elasticityand fatigue durability, thereby prolonging its service life, and is moresensitive to pressure, thereby enabling the diaphragm pump 100 tocontrol the flow precisely.

In some embodiments of the present disclosure, as shown in FIG. 3 incombination with FIGS. 4 and 5, the upper cover 22 constructs adownwardly open cavity structure, and an upper annular partition plate223 is provided to a bottom surface of the upper cover 22; the valveseat 23 constructs an upwardly open cavity structure, and a lowerannular partition plate 232 corresponding to the upper annular partitionplate 223 is provided to a top surface of the valve seat 23.

Specifically, a bottom of the upper cover 22 is recessed upwards to forma first groove, and the first groove is divided into an upper outergroove and an upper inner groove by the upper annular partition plate223. An upper surface of the valve seat 23 is recessed downwards to forma second groove corresponding to the first groove, and the second grooveis divided into a lower outer groove and a lower inner groove by thelower annular partition plate 232 corresponding to the upper annularpartition plate 223. The upper cover 22 is mounted to the valve seat 23in a sealing manner, and the water inlet cavity 212 located outside andthe water outlet cavity 211 located inside are partitioned by the upperannular partition plate 223 and the lower annular partition plate 232,in which the water inlet cavity 212 is communicated with the waterinlet, and the water outlet cavity 211 is communicated with the wateroutlet. That is, the upper annular partition plate 223 of the uppercover 22 and the lower annular partition plate 232 of the valve seat 23are snap-fitted, such that a cavity 21 between the upper cover 22 andthe valve seat 23 is divided into two.

In some embodiments of the present disclosure, as shown in FIGS. 1, 2and 3, the bottom of the water outlet cavity 211 is provided with themounting base 230. The diaphragm assembly 25 is mounted to the mountingbase 230, so as to control the opening and closure of the water outlethole 235. In other words, the water outlet cavity 211 is incommunication with the water outlet hole 235, and when the capsulecavity 912 is compressed, the water inlet valve block 26 closes thewater inlet hole 236 while the diaphragm assembly 25 opens the wateroutlet hole 235, such that the fluid in the capsule cavity 912 entersthe water outlet cavity 211 through the water outlet hole 235; when thecapsule cavity 912 is stretched and expanded, the water inlet valveblock 26 opens the water inlet hole 236 while the diaphragm assembly 25closes the water outlet hole 235, such that the fluid in the water inletcavity 212 enters the capsule cavity 912.

As shown in FIG. 7, the diaphragm assembly 25 includes the positioningplate 252 and the plurality of water outlet valve blocks 251. Upper andlower surfaces of the positioning plate 252 are configured as flatsurfaces. The water outlet valve block 251 is connected to a peripheraledge of the positioning plate 252 and extends towards a radial directionof the positioning plate 252. A distance between the upper surface ofthe water outlet valve block 251 and the upper surface of thepositioning plate 252 is identical to a distance between the lowersurface of the water outlet valve block 251 and the lower surface of thepositioning plate 252.

In other words, the upper surface and the lower surface of the diaphragmassembly 25 are symmetrically disposed relative to a central plane in anup-and-down direction of the diaphragm assembly 25, such that anoperator does not need to distinguish front and back sides when thediaphragm assembly 25 is mounted, thereby improving the mountingefficiency and reducing the production cost of the diaphragm pump 100.

In some optional embodiments, as shown in FIGS. 6, 7, 8 and 9, themounting base 230 is provided with the mounting groove 233 fitted withthe positioning plate 252. For example, the upper surface of the valveseat 23 is recessed downwards to form the mounting groove 233 configuredto mount and match with the positioning plate 252, or the upper surfaceof the valve seat 23 extends upwards to form the mounting groove 233configured to mount and match with the positioning plate 252. Thus, thepositioning plate 252 is reliably positioned on the valve seat 23.

In an optional embodiment of the present disclosure, referring to FIG.6, a connecting bridge 234 is provided between the support stand 231 andthe rib 2304, and the connecting bridge 234 is disposed opposite to thediaphragm part 254. An upper surface of the connecting bridge 234 isflush with the upper surface of the support stand, such that when thewater outlet valve block 251 is opened upwards, the diaphragm part 254moves downwards correspondingly, and since the presence of theconnecting bridge 234 serving as a support, the diaphragm part 254 isprevented from swinging downwards excessively.

In some embodiments of the present disclosure, referring to FIGS. 1 and3, the piston assembly 90 is connected to the bottom of the valve seat23 and includes the capsule body 91 having the capsule cavity 912. Thecapsule cavity 912 is communicated with the water inlet cavity 212 andthe water outlet cavity 211 through the water inlet hole 236 and thewater outlet hole 235 respectively. A bottom surface of the cylinderbody 24 extends downwards to form a stopping member 241.

The connecting rod assembly 30 drives the capsule body 91 to swing upand down between the upper movement dead point and the lower movementdead point to squeeze or stretch the capsule cavity 912 to realize thefunction of pumping the fluid. The connecting rod assembly 30 includesthe connecting rod 31, and the connecting rod 31 is connected with thecapsule body 91. A lower end face of the stopping member 241 is oppositeto and spaced at a predetermined distance from a central position in atop surface of the connecting rod 31.

Specifically, the connecting rod assembly 30 drives the capsule body 91to move; when the capsule cavity 912 is compressed by the connecting rodassembly 30, the water inlet valve block 26 closes the water inlet hole236 while the diaphragm assembly 25 opens the water outlet hole 235,such that the fluid in the capsule cavity 912 enters the water outletcavity 211 through the water outlet hole 235; when the capsule cavity912 is stretched and expanded by the connecting rod assembly 30, thewater inlet valve block 26 opens the water inlet hole 236 while thediaphragm assembly 25 closes the water outlet hole 235, such that thefluid in the water inlet cavity 212 enters the capsule cavity 912through the water inlet hole 236.

During the movement of the connecting rod 31 in the up-and-downdirection, due to the presence of the stopping member 241, it ispossible to effectively avoid a phenomenon of unstable flow caused by anupward drifting of the connecting rod 31 when the connecting rod 31drives the capsule body 91 to move, and hence a purpose of precisecontrol over the flow is also achieved.

For example, the lower end face of the stopping member 241 is spacedapart from the central position in the top surface of the connecting rod31 at a distance of 0.1-0.4 mm. That is, the distance of upward movementof the connecting rod 31 ranges from 0.1 mm to 0.4 mm. That is, theconnecting rod 31 squeezes the capsule cavity 912 upwards at an extentof 0.1-0.4 mm. In other words, the top surface of the connecting rod 31is always spaced from the lower end face of the stopping member 241 at acertain distance, in which the lower end face of the stopping member 241represents an upper movement dead point of the connecting rod 31, andupon the connecting rod 31 touches the lower end face of the stoppingmember 241, the connecting rod 31 is restricted from continuing movingupwards, such that it is possible to ensure that the amount ofcompression of the capsule cavity 912 compressed or stretched by theconnecting rod 31 is substantially constant every time, therebystabilizing the flow of the diaphragm pump 100.

In some embodiments of the present disclosure, referring to FIGS. 12 and13, the capsule body 91 includes the plurality of capsule cavities 912,the panel 911 and the mounting column 915. The plurality of capsulecavities 912 are open upwards. The panel 911 is connected to respectiveupper edges of the plurality of capsule cavities 912, such that theplurality of capsule cavities 912 are connected into a whole. The factthat the panel 911 connects the capsule cavities 912 into a whole makesthe processing simple and the mounting efficient, and saves both timeand labor.

Since the capsule body 91 is frequently squeezed and stretched, theplurality of capsule cavities 912 of the capsule body 91 which areintegrally molded are associated with each other, which renders highfatigue durability to the capsule body 91.

The mounting column 915 is mounted to a bottom of the capsule cavity912, and the connecting rod 31 is provided with a second mounting hole311 fitted with the mounting column 915. The mounting column 915 passesthrough the second mounting hole 311 to be connected with the connectingrod 31, in which a radial dimension of the mounting column 915 isgreater than a radial dimension of the second mounting hole 311, suchthat the connecting rod 31 during the movement will drive the capsulebody 91 to realize stretch or compression of the capsule body 91.

In some embodiments of the present disclosure, referring to FIG. 13, thecapsule cavity 912 includes a thin-walled part 914 and a thick-walledpart 913. The upper end of the mounting column 915 is connected with abottom surface of the thin-walled part 914. A circumferential edge of alower end of the thick-walled part 913 is connected with acircumferential edge of an upper end of the thin-walled part 914, and acircumferential edge of an upper end of the thick-walled part 913 isconnected with a bottom surface of the panel 911. It could be understoodthat due to the connection between the thin-walled part 914 and themounting column 915, the mounting column 915 will drive the thin-walledpart 914 to move, in which case the thin-walled part 914 is required tohave good elasticity and stretchability to achieve the stretch andcompression of the capsule body 91. It is known to all that in a certainrange, a relatively thin object has better elasticity, so the partconnected with the mounting column 915 is designed as the thin-walledpart 914. On the contrary, the upper end of the thick-walled part 913 isconnected with the panel 911, and the thick-walled part 913 is requiredto support the capsule cavity 912. Thus, the thick-walled part 913 notonly plays a stabilizing and positioning role, but also ensures that thethick-walled part 913 will not exhibit a phenomenon of distortion oreven displacement during operation of the diaphragm pump 100.

In some optional embodiments, a wall thickness of the thick-walled part913 is larger than that of the thin-walled part 914. The lower end ofthe thick-walled part 913 is connected with the upper end of thethin-walled part 914, so the difference in wall thickness between thethick-walled part 913 and the thin-walled part 914 should not be toolarge. For example, when the difference is 0.2 mm, smooth transitionbetween the thick-walled part 913 and the thin-walled part 914 can beattained. Thus, the capsule cavity 912 can have better stability andmaintain good deformability, and hence the diaphragm pump 100 can have astable output flow.

In a specific embodiment of the present disclosure, the cylinder body 24has the first mounting hole 243, and the capsule body 91 is snapped intothe first mounting hole 243 and immobilized relative to the firstmounting hole 243.

In some other optional embodiments of the present disclosure, as shownin FIG. 10, a second positioning column 242 is provided to a top surfaceof the cylinder body 24 and extends upwards, and the panel 911 isprovided with a second positioning hole 9110 fitted with the secondpositioning column 242.

In a specific embodiment of the present disclosure, a radial dimensionof the second positioning column 242 is greater than that of the secondpositioning hole 9110.

In other words, the thick-walled part 913 is in interference fit withthe first mounting hole 243, such that the capsule body 91 will notrotate in a circumferential direction of the first mounting hole 243 buthave a stable mutual positional relationship. In addition, the secondpositioning column 242 of the cylinder body 24 passes through the secondpositioning hole 9110 to be connected with the capsule body 91, andhence the capsule body 91 will not be displaced. The interference fitbetween the second positioning column 242 and the second positioninghole 9110 ensures stable connection between the capsule body 91 and thecylinder body 24.

In some embodiments of the present disclosure, as shown in FIGS. 1, 2, 3and 15, the diaphragm pump 100 includes the pump body 20, the pistonassembly 90, the water inlet valve block 26 and the diaphragm assembly25. The pump body 20 includes the upper cover 22, the valve seat 23 andthe cylinder body 24 which are connected in sequence. The valve seat 23has the water outlet hole 235, and a columnar boss 237 is provided tothe bottom surface of the valve seat 23 and extends downwards. Thecolumnar boss 237 has the water inlet hole 236 penetrating through thebottom and top surfaces of the valve seat 23. A circumferential wall ofthe columnar boss 237 extends obliquely from up to down to form a firstinclined surface 2370.

The upper cover 22 and the valve seat 23 construct the water inletcavity 212 located outside and the water outlet cavity 211 locatedinside, the water inlet cavity 212 is communicated with the capsulecavity 912 through the water inlet hole 236, and the water outlet cavity211 is communicated with the capsule cavity 912 through the water outlethole 235. The water inlet valve block 26 is provided to a bottom surfaceof the columnar boss 237 to open or close the water inlet hole 236, andthe diaphragm assembly 25 is provided to the top surface of the valveseat 23 to open or close the water outlet hole 235.

As shown in FIG. 12, the piston assembly 90 includes the capsule body 91and the panel 911. The capsule body 91 has the capsule cavity 912 openupwards, and an upper inner circumferential edge of the capsule cavity912 extends obliquely from up to down to form a second inclined surface9120. The first inclined surface 2370 is closely fitted with the secondinclined surface 9120. The panel 911 is connected to an upper outercircumferential edge of the capsule cavity 912 and located between thevalve seat 23 and the cylinder body 24.

Specifically, the upper cover 22 and the valve seat 23 are fitted todefine the water inlet cavity 212 and the water outlet cavity 211. Theconnecting rod assembly 30 drives the capsule body 91 to move; when thecapsule cavity 912 is compressed by the connecting rod assembly 30, thewater inlet valve block 26 closes the water inlet hole 236 while thediaphragm assembly 25 opens the water outlet hole 235, such that thefluid in the capsule cavity 912 enters the water outlet cavity 211through the water outlet hole 235; when the capsule cavity 912 isstretched and expanded by the connecting rod assembly 30, the waterinlet valve block 26 opens the water inlet hole 236 while the diaphragmassembly 25 closes the water outlet hole 235, such that the fluid in thewater inlet cavity 212 enters the capsule cavity 912 through the waterinlet hole 236.

When the valve seat 23 is fastened over the cylinder body 24, as shownin FIGS. 12, 14, 15 and 16, the first inclined surface 2370 of thecolumnar boss 237 of the valve seat 23 is fitted with the secondinclined surface 9120 of the piston assembly 90 seamlessly. When theconnecting rod assembly 30 compresses the capsule body 91, a small spaceis defined between the capsule body 91 and the bottom of the valve seat23, i.e. a compression space of the capsule cavity 912 is constant,which ensures that the diaphragm pump 100 can produce sufficientpressure for each compression, thereby improving working efficiency ofthe diaphragm pump 100, and stabilizing the output flow of the diaphragmpump 100.

Therefore, in the diaphragm pump 100 according to the presentdisclosure, since the columnar boss 237 is provided to the bottomsurface of the valve seat 23 and extends downwards, the circumferentialwall of the columnar boss 237 extends obliquely from up to down to formthe first inclined surface 2370, and the upper inner circumferentialedge of the capsule cavity 912 extends obliquely from up to down to formthe second inclined surface 9120, in which the first inclined surface2370 is closely fitted with the second inclined surface 9120, thediaphragm pump 100 can compress the fluid effectively and its workingefficiency can be improved.

In some embodiments of the present disclosure, referring to FIGS. 14, 15and 16, the columnar boss 237 has a third positioning hole 2371configured to immobilize the water inlet valve block 26, and a pluralityof water inlet holes 236 are defined in a circumferential direction ofthe third positioning hole 2371.

In an optional embodiment, as shown in FIG. 17, the water inlet valveblock 26 includes a valve membrane 261 and a third positioning column262. The valve membrane 261 covers the water inlet hole 236, and thethird positioning column 262 has a first end connected to the valvemembrane 261 and a second end upwardly extending through the thirdpositioning hole 2371.

The third positioning column 262 at an upper end of the water inletvalve block 26 is disposed through the third positioning hole 2371, suchthat the water inlet valve block 26 is fixedly mounted to the valve seat23, in which case the valve membrane 261 at a lower end of the waterinlet valve block 26 closes the water inlet hole 236. When theconnecting rod assembly 30 stretches the capsule body 91, the waterinlet valve block 26 opens the water inlet hole 236 and the fluid issucked into the capsule cavity 912. When the diaphragm pump 100operates, the plurality of small water inlet holes 236 effectivelydisperse the fluid in the water inlet cavity 212, restraining theproduction of a turbulent flow, and hence the diaphragm pump 100 canoutput the flow rate stably.

In an optional embodiment, as shown in FIGS. 15 and 17, the first end ofthe third positioning column 262 forms an anti-rotation flange 263, andthe third positioning hole 2371 has a position-limiting groove 2372fitted with the anti-rotation flange 263. The anti-rotation flange 263of the water inlet valve block 26 is fitted with the position-limitinggroove 2372 of the third positioning hole 2371 to limit a degree offreedom of the water inlet valve block 26 in the circumferentialdirection, such that the water inlet valve block 26 cannot rotate in thecircumferential direction.

In another optional embodiment, as shown in FIGS. 3, 16 and 17, thesecond end of the third positioning column 262 is provided with aposition-limiting protrusion 264, and the position-limiting protrusion264 abuts against the top surface of the valve seat 23. That is, anouter diameter of the position-limiting protrusion 264 is larger than aninner diameter of the third positioning hole 2371, and after the thirdpositioning column 262 passes through the third positioning hole 2371, abottom of the position-limiting protrusion 264 abuts against the topsurface of the valve seat 23. In other words, the water inlet valveblock 26 is clamped to the valve seat 23. A degree of freedom of thewater inlet valve block 26 in an axial direction is limited, and thewater inlet valve block 26 cannot be disengaged from the valve seat 23in the axial direction. The water inlet valve block 26 is made of amaterial having deformability, for example, rubber, such that theposition-limiting protrusion 264 can passes through the thirdpositioning hole 2371 smoothly after squeezed and deformed.

In some embodiments of the present disclosure, as shown in FIG. 14, thecolumnar boss 237 has an avoidance notch 2373, and an inlet end of thewater outlet hole 235 is arranged opposite to the avoidance notch 2373.That is, an inlet end face of the water outlet hole 235 is not in thesame plane as an outlet end face of an outlet end of the water inlethole 236, so it is ensured that a water inlet passage and a water outletpassage are effectively separated.

In some optional embodiments, as shown in FIGS. 14 and 16, threecolumnar bosses 237 are provided to the bottom surface of the valve seat23, and constitute an equilateral triangle. Certainly, it could beunderstood that the position and number of the columnar boss 237 isdetermined based on the position and number of the capsule cavity 912.Embodiments of the present disclosure are only explanatory. For example,the number of the columnar bosses 237 can be set to four, and fourcolumnar bosses 237 constitute a square or other shapes. The regulararrangement of the columnar bosses 237 allows the valve seat 23 to beprocessed simply and reduces material costs.

In some embodiments of the present disclosure, the connecting rodassembly 30 for the diaphragm pump 100 includes the connecting rod 31and the steel shaft 32, as shown in FIGS. 2, 18, 21 and 23. Theconnecting rod 31 includes a rod body 312 and a mounting plate 313. Afirst end of the rod body 312 is provided with the connecting hole 3121extending along an axial direction of the rod body 312, and the mountingplate 313 is connected to a second end of the rod body 312. A pluralityof connecting arms 314 are spaced along a circumferential direction ofthe mounting plate 313, and the mounting plate 313 has a plurality ofmaterial-reducing holes 3131. The steel shaft 32 is connected with theconnecting hole 3121.

Specifically, as shown in FIG. 23, the steel shaft 32 has the lower endconnected with the driving assembly 10 and the upper end inserted intothe connecting hole 3121. An inner diameter D of the connecting hole3121 is adapted to a diameter of the steel shaft 32. For example, theinner diameter D of the connecting hole 3121 can be 1.52 mm. Certainly,the embodiments of the present disclosure are only explanatory, and theinner diameter D can be set to other values in the light of practicalsituations. The driving assembly 10 drives the steel shaft 32 to rotate,the plurality of connecting arms 314 are connected to the mountingcolumn 915 respectively, and the steel shaft 32 drives the connectingrod 31 to rotate, such that the stretch and compression of the capsulebody 91 by the connecting rod assembly 30 are realized.

The inventor finds in practice that since the mounting plate 313 isprovided with the connecting hole 3121 in the center, during a moldingprocess of the connecting rod 31, shrinkage or insufficient molding mayoccur to the periphery of the connecting hole 3121 due to unevenness inthickness, resulting in generation of air bubbles. In order to solvethis problem, the plurality of material-reducing holes 3131 are providedaround the connecting hole 3121, correspondingly, a loose core isadditionally provided to a mold, and an exhaust passage keepsunobstructed to exhaust most of the air generated by uneven shrinkageout of the mold, such that the air bubbles generated during the moldingprocess of the connecting rod 31 can be reduced.

For the connecting rod assembly 30 of the diaphragm pump 100 accordingto the present disclosure, by providing the plurality ofmaterial-reducing holes 3131 in the mounting plate 313, it is possibleto reduce the air bubbles generated during the molding process of theconnecting rod 31 and prolong service life of the connecting rod 31.

In some embodiments of the present disclosure, as shown in FIGS. 18 and20, the material-reducing hole 3131 is formed by recessing a top surfaceof the mounting plate 313 downwardly. The inventor notes that during themolding process, an upper part of the connecting rod 31 is finallycooled, and if the material-reducing hole 3131 is provided in a lowerpart, the air cannot be exhausted when liquid metal is solidified andshrunk, which likewise results in the air bubbles due to an excessivewall thickness difference. Thus, the material-reducing hole 3131 isprovided in the upper part instead of the lower part.

In some embodiments, as shown in FIG. 20, the plurality of connectingarms 314 obliquely extend downwards and outwards from the centralposition in the mounting plate 313. In other words, the connecting arms314 are not in the same plane, and for example, an included angle C maybe 8 degrees. Certainly, the embodiments of the present disclosure areonly explanatory, and the included angle C between the connecting arm314 and the horizontal plane can be set according to practicalsituations.

For example, the connecting rod includes three connecting arms 314.Since the connecting rod 31 compresses or stretches different capsulebodies 91 at the same time, the steel shaft 32 is configured as aneccentric shaft, and correspondingly, the connecting arms 314 areinclined downwards, such that no matter which position the steel shaft32 rotates to, one of the connecting arms 314 stretches the capsule body91, another connecting arm 314 compresses the capsule body 91, and theremaining capsule body 91 is either stretched or compressed, therebyrealizing water intake and drainage processes of the diaphragm pump 100.Certainly, the embodiments of the present disclosure are onlyexplanatory, and for example, four or more connecting arms 314 can beprovided.

In some other embodiments, referring to FIGS. 19, 21, 22 and 23, aplurality of heat radiating grooves 3122 are provided to acircumferential face of the connecting hole 3121, and the plurality ofheat radiating grooves 3122 extend along an axial direction of theconnecting hole 3121. During the rotation of the connecting rod assembly30, the steel shaft 32 rubs against the connecting rod 31, generating alot of heat, and if the heat cannot be discharged in time, abrasion ofthe connecting rod assembly 30 will be aggravated, resulting in failureof the diaphragm pump 100. By providing the plurality of heat radiatinggrooves 3122 in a circumferential direction of the connecting hole 3121,the heat generated by friction between the steel shaft 32 and theconnecting rod 31 can be discharged in time through the heat radiatinggrooves 3122, thereby prolonging a process of disabling the connectingrod assembly 30 due to abrasion and extending service life of theconnecting rod assembly 30.

In some embodiments of the present disclosure, referring to FIGS. 18, 20and 21, a free end of each connecting arm 314 is provided with amounting protrusion 3141, and a lower end face of the mountingprotrusion 3141 is lower than a lower end face of the connecting arm314. The second mounting hole 311 is provided in the center of themounting protrusion 3141, the mounting column 915 of the capsule body 91passes through the second mounting hole 311 to be connected with theconnecting rod 31, and an axial dimension of the second mounting hole311 matches an axial dimension of the mounting column 915.

In some optional embodiments, as shown in FIG. 21, a reinforcing rib 315is provided between an outer circumferential surface of the mountingprotrusion 3141 and an outer circumferential surface of the rod body312, and the reinforcing rib 315 extends upwards to be connected to abottom surface of the mounting plate 313. Since the lower end face ofthe mounting protrusion 3141 is lower than that of the connecting arm314, a protruding surface of the mounting protrusion 3141 is too large,and a connecting surface of the mounting protrusion 3141 itself can onlywithstand a limited load. In view of this, the reinforcing rib 315 isadditionally provided to a common surface to which the mountingprotrusion 3141 and the rod body 312 are both perpendicular, so as toenhance strength of a joint surface.

In some embodiments, as shown in FIGS. 1 and 3, the connecting rodassembly 30 is provided within the chamber 27. The connecting rodassembly 30 includes the eccentric wheel 33, the connecting rod 31 andthe steel shaft 32. The eccentric wheel 33 is provided with an inclinedeccentric hole 331 in an axial direction of the eccentric wheel 33, andthe eccentric wheel 33 is connected with the electric motor shaft 121 ofthe electric motor 12.

As shown in FIG. 2, a photoelectric shielding sheet 40 is integrallyformed with the eccentric wheel 33, that is, the photoelectric shieldingsheet 40 and the eccentric wheel 33 are configured as a whole and areinseparable. Thus, a manufacturing process of the eccentric wheel 33 canbe simplified, reducing assembly steps, and the photoelectric shieldingsheet 40 is prevented from shaking or even dropping.

In an optional embodiment, as shown in FIG. 2, the photoelectricshielding sheet 40 is integrally formed with the eccentric wheel 33 androtates synchronously with the eccentric wheel 33, in which thephotoelectric shielding sheet 40 is disposed to an upper surface of theeccentric wheel 33. The photoelectric shielding sheet 40 can be providedwith an inclined hole 41 corresponding to the eccentric hole 331 of theeccentric wheel 33. The lower end of the steel shaft 32 is inserted intothe inclined hole 41 and the eccentric hole 331, while the upper end ofthe steel shaft 32 is connected with the connecting rod 31.

A photoelectric sensor 50 is provided to the base seat 11, and thephotoelectric sensor 50 cooperates with the photoelectric shieldingsheet 40, so as to detect a rotational speed of the electric motor shaft121 and send a detection signal to an electric motor controller. Theelectric motor controller is configured to adjust the rotational speedof the electric motor shaft 121 of the electric motor 12 according tothe detection signal.

As shown in FIG. 1 and FIG. 2, the photoelectric sensor 50 is disposedin the chamber 27, and the photoelectric sensor 50 is provided with athrough groove throughout along a rotating piece of the photoelectricshielding sheet 40. The photoelectric shielding sheet 40 passes throughthe through groove when rotating, so as to detect the rotational speedof the electric motor shaft 121 and send the detection signal to theelectric motor controller, such that the electric motor controllerprecisely controls the rotational speed of the electric motor shaft 121.

In the diaphragm pump 100 according to embodiments of the presentdisclosure, by forming the photoelectric shielding sheet 40 integrallywith the eccentric wheel 33, the stability of the photoelectricshielding sheet 40 during rotation is improved, and the working noiseand production cost of the diaphragm pump 100 is reduced.

In an optional embodiment, as shown in FIG. 2, the photoelectricshielding sheet 40 extends outwards along a radial direction of theeccentric wheel 33. The photoelectric sensor 50 is provided to an innerwall face of the base seat 11, and an opening of the through groovefaces the inside. Thus, during the rotation of the eccentric wheel 33,the photoelectric shielding sheet 40 can extend into the through grooveto play a role of shielding light.

In an optional embodiment, as shown in FIG. 1 and FIG. 2, thephotoelectric shielding sheet 40 includes a positioning portion and ashielding portion. The positioning portion is provided to the uppersurface of the eccentric wheel 33, and the shielding portion isconnected to the positioning portion and extends radially outwards. Theshielding portion can be configured as a fan shape, but it could beunderstood that the shape of the shielding portion is not limited andinstead can be configured as other shapes in the light of practicalsituations. Thus, in the through groove of the photoelectric sensor 50,light can be effectively shielded by the shielding portion, so that thephotoelectric sensor 50 can detect the rotational speed of the electricmotor shaft 121 accurately.

In some further embodiments of the present disclosure, as shown in FIGS.24 and 25, the diaphragm pump 100 further includes a printed circuitboard 70. The printed circuit board 70 is provided to the base seat 11and connected with the photoelectric sensor 50. The printed circuitboard 70 is provided with a lead wire connector 71, and a lead wire 80is electrically connected to the printed circuit board 70 through thelead wire connector 71. One of the lead wire 80 and the lead wireconnector 71 is provided with a lead wire plug 81, while the other oneof the lead wire 80 and the lead wire connector 71 is provided with alead wire jack 711, the lead wire plug 81 being plugged into the leadwire jack 711.

The lead wire plug 81 may be provided to the lead wire 80. At the sametime, the lead wire jack 711 is provided to the lead wire connector 71.By plugging the lead wire plug 81 of the lead wire 80 in the lead wirejack 711 of the lead wire connector 71 to complete the connectionbetween the lead wire 80 and the lead wire connector 71, the electricalconnection between the lead wire 80 and the printed circuit board 70 canbe implemented, such that the lead wire 80 can transmit electriccurrents and signals to the photoelectric sensor 50 to ensure the normaloperation of the diaphragm pump 100. When the lead wire 80 needs to bedisassembled due to maintenance or other reasons, the lead wire 80 canbe removed from the lead wire connector 71 directly. Thus, by providingthe lead wire connector 71 to the printed circuit board 70, theconnection and disassembly between the lead wire 80 and the printedcircuit board 70 is convenient, and the cost is low.

Certainly, the lead wire plug 81 can be provided to the lead wireconnector 71, and at the time the lead wire jack 711 is provided to thelead wire 80. By plugging the lead wire plug 81 of the lead wireconnector 71 in the lead wire jack 711 of the lead wire 80, it is alsoconvenient for the connection and disassembly between the lead wire 80and the printed circuit board 70, and the cost of the diaphragm pump 100is low.

For the diaphragm pump 100 according to embodiments of the presentdisclosure, the precise control over the flow of the diaphragm pump maybe achieved; and by providing the lead wire connector 71 to the printedcircuit board 70 and by plugging the lead wire plug 81 provided to oneof the lead wire 80 and the lead wire connector 71 into the lead wirejack 7111 provided to the other one of the lead wire 80 and the leadwire connector 71, it is convenient for the connection and disassemblybetween the lead wire 80 and the printed circuit board 70, and the costis low.

Other constructions of the diaphragm pump 100 according to embodimentsof the present disclosure are well known to those skilled in the art andwill not be elaborated herein.

In the specification, it is to be understood that terms such as “upper,”“lower,” “bottom,” “inner,” “outer,” should be construed to refer to theorientation as then described or as shown in the drawings underdiscussion. These relative terms are for convenience of description anddo not require that the present invention be constructed or operated ina particular orientation, thus these relative terms should not beconstrued as a limit to the present disclosure. In the presentinvention, unless specified or limited otherwise, a structure in which afirst feature is “on” or “below” a second feature may include anembodiment in which the first feature is in direct contact with thesecond feature, and may also include an embodiment in which the firstfeature and the second feature are not in direct contact with eachother, but are contacted via an additional feature formed therebetween.Furthermore, a first feature “on,” “above,” or “on top of” a secondfeature may include an embodiment in which the first feature is right orobliquely “on,” “above,” or “on top of” the second feature, or justmeans that the first feature is at a height higher than that of thesecond feature; while a first feature “below,” “under,” or “on bottomof” a second feature may include an embodiment in which the firstfeature is right or obliquely “below,” “under,” or “on bottom of” thesecond feature, or just means that the first feature is at a heightlower than that of the second feature.

Reference throughout this specification to “an embodiment,” “someembodiments,” “an example,” “a specific example,” or “some examples”means that a particular feature, structure, material, or characteristicdescribed in connection with the embodiment or example is included in atleast one embodiment or example of the present disclosure. Thus, theappearances of the phrases such as “in some embodiments,” “in oneembodiment”, “in an embodiment”, “in another example,” “in an example,”“in a specific example,” or “in some examples,” in various placesthroughout this specification are not necessarily referring to the sameembodiment or example of the present disclosure. Furthermore, theparticular features, structures, materials, or characteristics may becombined in any suitable manner in one or more embodiments or examples.

Although explanatory embodiments have been shown and described, it wouldbe appreciated by those skilled in the art that the above embodimentscannot be construed to limit the present disclosure, and changes,modifications, alternatives and variants can be made in the embodimentswithout departing from spirit, principles and scope of the presentdisclosure.

What is claimed is:
 1. A diaphragm pump, comprising: a pump bodycomprising an upper cover, a valve seat and a cylinder body connected insequence, the valve seat having a water inlet hole and a water outlethole, the upper cover and the valve seat defining a water inlet cavityand a water outlet cavity independent from each other, the water inlethole being in communication with the water inlet cavity while the wateroutlet hole being in communication with the water outlet cavity, amounting base being provided to a bottom of the water outlet cavity, anda plurality of spaced first position-limiting members being formed at atop of the water outlet cavity and extending downwards; a water inletvalve block provided to a bottom surface of the valve seat to open orclose the water inlet hole; a diaphragm assembly mounted to the mountingbase to control opening or closure of the water outlet hole, andcomprising a plurality of water outlet valve blocks arranged opposite tothe plurality of first position-limiting members; a piston assemblyconnected to a bottom of the valve seat, and comprising a capsule bodyhaving a capsule cavity, the capsule cavity being communicated with thewater inlet cavity and the water outlet cavity through the water inlethole and the water outlet hole respectively; a connecting rod assemblydriving the capsule body to swing up and down between an upper movementdead point and a lower movement dead point to squeeze or stretch thecapsule cavity so as to realize a function of pumping fluid, theconnecting rod assembly comprising: a connecting rod connected with thecapsule body, a steel shaft having an upper end connected with aconnecting hole, and an eccentric wheel connected with a lower end ofthe steel shaft; a driving assembly comprising: a base seat connected tothe pump body to define a chamber and an electric motor having anelectric motor shaft connected with the eccentric wheel.
 2. Thediaphragm pump according to claim 1, wherein the diaphragm assemblycomprises a positioning plate having an upper surface and a lowersurface both configured as flat surfaces, and the positioning platecomprises: a central positioning plate; and positioning strips connectedto a circumferential edge of the central positioning plate and extendsalong a radial direction of the central positioning plate, wherein thewater outlet valve block is connected to the circumferential edge of thecentral positioning plate and extends along the radial direction of thecentral positioning plate, and a distance between an upper surface ofthe water outlet valve block and the upper surface of the positioningplate is identical to a distance between a lower surface of the wateroutlet valve block and the lower surface of the positioning plate, thewater outlet valve block being located between two positioning strips.3. The diaphragm pump according to claim 2, wherein the mounting basehas a mounting groove matching the positioning plate in shape, and themounting groove comprises: a central groove in which the centralpositioning plate is snapped; branch grooves distributed in acircumferential direction of the central groove and communicated withthe central groove, the positioning strip being snapped in the branchgroove, a second position-limiting member being provided to the top ofthe water outlet cavity, and a lower end of the second position-limitingmember being in contact with an upper surface of the positioning strip.4. The diaphragm pump according to claim 3, wherein a distance betweenan upper surface of the branch groove and the lower end of the secondposition-limiting member is smaller than a thickness of the positioningstrip.
 5. The diaphragm pump according to claim 3, wherein the centralgroove is provided with a first positioning column, and the centralpositioning plate is provided with a first positioning hole fitted withthe first positioning column.
 6. The diaphragm pump according to claim3, wherein a rib is provided along a peripheral edge of the mountinggroove.
 7. The diaphragm pump according to claim 6, wherein an end ofthe branch groove away from the central groove is provided with abaffle, and an upper surface of the baffle is higher than an uppersurface of the rib.
 8. The diaphragm pump according to claim 6, whereinthe bottom of the water outlet cavity is provided with a support standhaving a through hole in communication with the water outlet hole, andthe support stand is connected to the rib at a circumferential edge ofthe central groove.
 9. The diaphragm pump according to claim 8, whereina diaphragm part is provided between the water outlet valve block andthe central positioning plate, and an arc groove is formed at a positionwhere a peripheral edge of the diaphragm part is connected with thepositioning strip.
 10. The diaphragm pump according to claim 9, whereina connecting bridge is provided between the support stand and the rib,and the connecting bridge is disposed opposite to the diaphragm part.11. The diaphragm pump according to claim 2, wherein the positioningstrips are equally spaced and distributed along the circumferential edgeof the central groove, and the water outlet valve block and two adjacentpositioning strips are spaced from each other.
 12. The diaphragm pumpaccording to claim 1, wherein the upper cover constructs a downwardlyopen cavity structure, and an upper annular partition plate is providedto a bottom surface of the upper cover; the valve seat constructs anupwardly open cavity structure, and a lower annular partition platecorresponding to the upper annular partition plate is provided to a topsurface of the valve seat.
 13. The diaphragm pump according to claim 1,wherein a bottom surface of the cylinder body extends downwards to forma stopping member, and a lower end face of the stopping member isopposite to and spaced at a predetermined distance from a centralposition in a top surface of the connecting rod.
 14. The diaphragm pumpaccording to claim 1, wherein the capsule body comprises: a plurality ofcapsule cavities open upwards; a panel located between the valve seatand the cylinder body and connected to respective upper outercircumferential edges of the plurality of capsule cavities, so as toconnect the plurality of capsule cavities into a whole; a mountingcolumn connected to a bottom of the capsule cavity, the connecting rodbeing provided with a second mounting hole fitted with the mountingcolumn.
 15. The diaphragm pump according to claim 14, wherein thecapsule cavity comprises: a thin-walled part having a bottom surfaceconnected with an upper end of the mounting column; and a thick-walledpart having a lower end whose circumferential edge is connected with acircumferential edge of an upper end of the thin-walled part, and anupper end whose circumferential edge is connected with a bottom surfaceof the panel.
 16. The diaphragm pump according to claim 15, wherein awall thickness of the thick-walled part is larger than that of thethin-walled part.
 17. The diaphragm pump according to claim 14, whereina second positioning column is provided to a top surface of the cylinderbody and extends upwards, and the panel is provided with a secondpositioning hole fitted with the second positioning column.
 18. Thediaphragm pump according to claim 17, wherein the second positioningcolumn is in interference fit with the second positioning hole.
 19. Thediaphragm pump according to claim 1, wherein the cylinder body isprovided with a first mounting hole, and the capsule body is snappedinto the first mounting hole and immobilized relative to the firstmounting hole.
 20. The diaphragm pump according to claim 1, wherein acolumnar boss is provided to the bottom surface of the valve seat andextends downwards, the columnar boss has the water inlet holepenetrating through the bottom and top surfaces of the valve seat, and acircumferential wall of the columnar boss extends obliquely from up todown to form a first inclined surface.
 21. The diaphragm pump accordingto claim 20, wherein an upper inner circumferential edge of the capsulecavity extends obliquely from up to down to form a second inclinedsurface, the first inclined surface being closely fitted with the secondinclined surface.
 22. The diaphragm pump according to claim 20, whereinthe columnar boss has a third positioning hole configured to immobilizethe water inlet valve block, and a plurality of water inlet holes aredefined in a circumferential direction of the third positioning hole.23. The diaphragm pump according to claim 22, wherein the water inletvalve block comprises: a valve membrane covering the water inlet hole;and a third positioning column having a first end connected to the valvemembrane and a second end upwardly extending through the thirdpositioning hole.
 24. The diaphragm pump according to claim 23, whereinthe first end of the third positioning column forms an anti-rotationflange, and the third positioning hole has a position-limiting groovefitted with the anti-rotation flange.
 25. The diaphragm pump accordingto claim 23, wherein the second end of the third positioning column hasa position-limiting protrusion, and the position-limiting protrusionabuts against the top surface of the valve seat.
 26. The diaphragm pumpaccording to claim 20, wherein the columnar boss has an avoidance notch,and an inlet end of the water outlet hole is arranged opposite to theavoidance notch.
 27. The diaphragm pump according to claim 20, whereinthree columnar bosses are provided to the bottom surface of the valveseat, and the three columnar bosses constitute an equilateral triangle.28. The diaphragm pump according to claim 1, wherein the connecting rodcomprises: a rod body having a first end of the rod body provided withthe connecting hole extending along an axial direction of the rod body,a circumferential face of the connecting hole being provided with aplurality of heat radiating grooves, and the plurality of heat radiatinggrooves extending along an axial direction of the connecting hole; and amounting plate connected to a second end of the rod body, a plurality ofconnecting arms being spaced along a circumferential direction of themounting plate, the mounting plate having a plurality ofmaterial-reducing holes formed by recessing a top surface of themounting plate downwardly, the plurality of connecting arms obliquelyextending downwards and outwards from a central position in the mountingplate, a free end of each connecting arm being provided with a mountingprotrusion, and a lower end face of the mounting protrusion being lowerthan a lower end face of the connecting arm.
 29. The diaphragm pumpaccording to claim 28, wherein a reinforcing rib is provided between anouter circumferential surface of the mounting protrusion and an outercircumferential surface of the rod body, and the reinforcing rib extendsupwards to be connected to a bottom surface of the mounting plate. 30.The diaphragm pump according to claim 1, further comprising: aphotoelectric shielding sheet integrally formed with the eccentric wheeland rotating synchronously with the eccentric wheel and the electricmotor shaft; and a photoelectric sensor provided to the base seat andcooperating with the photoelectric shielding sheet so as to detect arotational speed of the electric motor shaft and send a detection signalto an electric motor controller, the electric motor controller beingconfigured to adjust the rotational speed of the electric motor shaft ofthe electric motor according to the detection signal.
 31. The diaphragmpump according to claim 30, wherein the photoelectric shielding sheetextends outwards along a radial direction of the eccentric wheel. 32.The diaphragm pump according to claim 30, wherein the photoelectricshielding sheet comprises: a positioning portion provided to an uppersurface of the eccentric wheel; and a shielding portion connected to thepositioning portion and extending radially outwards.